Entropy
Entropy is a data structure that embodies the notion of time. In other words, it is a time-like structure.
Entropy is time, and time is money
It was Bitcoin and its mining mechanism/blockchain as a time-like structure show that it is possible to use time as a way to issue currency with physical grounded phenomenon.
References
Anderson, Walter. Study of Entropy. local page. Retrieved Sep 24, 2021.
Hardy, Seth (May 20, 2004). Pseudorandom Number Generation, Entropy Harvesting, and Provable Security in Linux (PDF). tsumego foundation. Retrieved Sep 24, 2021.